CVE-2026-65601: Traefik

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.

Affected products

• Traefik Traefik: from 3.7.0, before 3.7.7 (fixed in 3.7.7)

Published 2026-07-22. Last modified 2026-10-08.